Furnace



(No Model.)

W. OEHLSTROM.

FURNAGE No. 565,214. Patentdiug. 4, 1896.

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UNITED STATES PATENT O EicE.

TVILLIAM OEHLSTROM, OF CLEVELAND, OHIO.

' FURNACE.

SPECIFICATION forming part of Letters Patent No. 565,214, dated August4, 1896.

Application filed October 10, 1895. Serial No. 565,238. (No model.)

To aZZ whom it may concern:

Be it known that 1, WILLIAM OEHLSTROM, a citizen of the United States,residing at Cleveland, in the county of Guyahoga and State of Ohio, haveinvented certain new and useful Improvements in Furnaces, of which thefollowing is a full, clear, and exact description.

My invention relates to furnaces for boilers, but especially to thosebuilt with stokergrates; and it consists of the several arches,chambers, and flues hereinafter fully described and specificallyclaimed.

The object of my improvement is to provide a furnace which utilizes theheat generated from the burning fuel on the grate to a greater extentthan is possible in an ordinary furnace by introducing oxygen into thesmoke or carbon thrown off from said fuel at the proper place, andincidentally preventing said smoke from contaminating the outsideatmosphere. It is well known that carbon united with oxygen, ifsubjected to heat, burns readily, forming in fact perfect combustion,and I provide for this union of elements in my furnace, as will appearmore fully hereinafter.

That my invention may be seen and fully understood by those skilled inthe art, reference will be had to the following specification andannexed drawings, forming a part thereof, in which- Figure 1 is alongitudinal vertical section of my improved furnace; Fig. 2, atransverse vertical section taken forward of the front end of the lowerbroad arch; and Fig. 3, a transverse vertical section taken between therear end of the upper broad arch and the transverse narrow arch, both ofsaid transverse sections looking toward the rear.

Similar figures of reference designate like parts in the drawings andspecification.

The furnace shown in the drawings has the side walls 1 1 and thebridge-wall 2, and opens into the chimney 3 through the line 4. Thechimney 3 is necessary to provide a draft for the furnace, but all orthe greater portion of the smoke is consumed and does not pass throughsaid chimney. The location and pitch of a Stoker-grate are indicated bythe line 5 in Fig. 1. The boiler 6 is mounted over the furnace and itssides are contiguous with the walls 1.

The narrow transverse arch 7, extending from one side wall 1 to theother, is built tight to the boiler 6 and projects below the same. Thearch '7 is located some distance in front of the face of the bridge-wallThe narrow transverse arch 8 is built tight to the lower half of theboiler 6 at the front, between the walls 1, to form with the arch 7 andthe broad arch 9 the chambers 10 10, one each side of and beneath saidboiler. The broad arch 9 extends between the walls 1 and from the arch Srearward nearly to the arch 7, and said arch 9 may be a little remotefrom the bottom of the boiler 6, as shown, or it may be contiguoustherewith. As illustrated in the drawings, the chambers 10 communicatewith each other between the boiler (i and the arch 9. Below the arch 9and remote therefrom is the broad arch 11, extending between the walls 1and from the narrow arch 7 forward nearly to the arch 8. The wide fine12 is formed by the arches 9 and 11.

Air is supplied to the chambers 10 through the fines 13 13, which openinto the front of said chambers, near the arch 9, from the walls 1. In anew furnace it is desirable to carry the fines 13 from the front of thechambers 10 rearward, downward, and then forward, as indicated by thedotted lines in Fig. 1, to open through the front ends of said walls;but in an old setting the fines 13 may be carried directly downward toopen into the ash-pit, as shown by the dotted lines 13 in Fig. 2, orthrough either the front or outside of the walls 1. The object ofcarrying the flues 13 as far as possible in the walls 1 is to utilizethe heat contained in said walls, which would otherwise be lost.

Air is drawn into the chambers 10 through the fines 13 and passes thencebetween the arch 7 and the'end of the arch 9 into the wide flue 12. Theair is heated before it reaches the wide flue 12, but there, owing tothe ex- 9 the nitrogen, passes from the flue 12, between the arch 8 andthe end of the arch 11, into the front of the fire to spread over theentire body of the same and mingle with the smoke or carbon rising fromthe burning fuel. The commingled oxygen and carbon at once ignite andburn with a bright flame.

The consumption of smoke arising from the burning fuel both utilizesheat which would otherwise be lost and prevents the contamination of theoutside atmosphere by said smoke.

A Stoker-grate enhances the usefulness of my invention, because agreater amount of heat is obtained therefrom.

The arches 9 and 11 may be longer or shorter than shown in the drawingswithout departing from the nature of my invention.

What I claim as my invention, and desire to secure by Letters Patent,is-- 1. The combination in a furnace, of narrow transverse front andrear arches built tight to the boiler and extending below the same, andupper and under broad arches below said boiler and remote from eachother, the former extending from said front arch nearly to said reararch and the latter extending from said rear arch nearly to said frontarch, substantially as and for the purpose set forth.

2. The combination in a furnace, of side walls, narrow transverse frontand rear arches built tight to the boiler and extending below the same,upper and under broad arches below said boiler and remote from eachother, the former extending from said front arch nearly to said reararch and the latter extending from said rear arch nearly to said frontarch, and fines opening into the space between said upper broad arch andboiler from said side walls, substantially as and for the purpose setforth.

3. The combination in afurnace, of a chamber or chambers formed by theboiler, the side walls, narrow transverse front and rear arches and abroad arch; fiues opening into said chambers from said side walls, and awide flue formed by broad arches beneath said boiler opening at the rearinto said chambers and at the front over the fire, substantially as andfor the purpose set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

\VILLIAM OEHLSTROM.

WVitnesses F. A. CUTTER, L. A. STRATTON.

